Ayaka's father was a wealthy man, but he has already passed away, and now she lives with her mother, Mitsuko. Ayaka has a fiancé named Kazuma, but he has a large amount of debt. Kazuma is more interested in the fortune, or Ayaka Mitsuko, who manages the fortune, than Ayaka... Kazuma has a strong sadistic tendency, but he hides it from Ayaka. Then, unable to bear the strong demands of his creditor, Sagawa, Kazuma tells him his plan. And so the two beasts feast their lips on the delicious mother-daughter bowl of immorality.